pmns/Make: drop duplicate if/else
pmns/Make: drop duplicate if/else

As of 029add427a42344ea7129452c9e0fb286d3cf881, both the if and else
branches here match. Restoration of the previous build-time logic is
tracked via https://github.com/performancecopilot/pcp/issues/1140 and
will affect more scripts than just this one.

Signed-off-by: David Disseldorp <589a549dc9f982d9f46aeeb82a09ab6d87ccf1d8@suse.de>

adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp,adfernandes/pcp